Firefox 4 is just around the corner and it’s time to update your add-ons! Developers of Mozilla-approved add-ons compatible with the latest Firefox 4 beta or 4.0.* by January 7, 2011 are eligible to receive a free Firefox 4 t-shirt from Mozilla. If your add-on meets the criteria, just fill out this form before January 7.
Resources for updating your add-on: